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在发生错误时获取完整的http响应

rxjs error-handling angular

1

Renaud is Not Bill Gates · 技术社区 · 7 年前

在角度文档中,他们指出您必须指定 observe: "response" 在提供的获取完整http响应的选项上,我在这里执行了以下操作:

constructor(private service: new () => T,
  private http: HttpClient,
  private httpErrorHandler: HttpErrorHandlerService,
){ 
    this._handleError = this.httpErrorHandler.createHandleError(this.service.name);
}
private _handleError: HandleError;
//...other code
delete(resourceNameOrId: number | string): Observable<HttpErrorResponse>{
    return this.http.delete<T>(this._url + resourceNameOrId, {
      observe: "response"
    }).pipe(
      catchError(this._handleError(`delete`, null))
    );
  }

export type HandleError = <T> (operation?: string, result?: T) => (error: HttpErrorResponse) => Observable<T>;

@Injectable({
  providedIn: 'root'
})
export class HttpErrorHandlerService {

  constructor(private errorService: ErrorService, private modalService: NzModalService) { }

  createHandleError = (serviceName = '') => <T> (operation = 'operation', result = {} as T) => this.handleError(serviceName, operation, result);

  handleError<T> (serviceName = '', operation = 'operation', result = {} as T ){
    return (error: HttpErrorResponse): Observable<T> => {
      const message = (error.error instanceof ErrorEvent) ? error.error.message: `{error code: ${error.status}, body: "${error.message}"}`;
      this.errorService.errorMessage = `${serviceName} -> ${operation} failed.\n Message: ${message}`;
      console.error(this.errorService.errorMessage);
      return of(result);
    }
  }
}

这是我如何在组件中调用服务删除函数的示例:

this.service.delete(nom).subscribe(data => {
  if(!this.errorService.errorMessage){
    this.notificationService.success("Suppression", "L'enregistrement a Ã©tÃ© supprimÃ©e !");
  }
});

注意:“回应” 在我的情况下不起作用,而且 error: HttpErrorResponse

我已经尝试过这方面的解决方案: Angular 4.3.3 HttpClient : How get value from the header of a response? 这对我不起作用,提供的解决方案是定义observe选项。

我怎样才能解决这个问题?

“观察”选项仅在删除http请求返回200代码时有效,如下面的屏幕截图所示,但当存在404响应状态时,本例中的响应对象为null,在handleError函数中,响应主体是我唯一可以访问的对象。

2 回复 | 直到 6 年前

1

0

mihan oktavian 7 年前

通过拦截器拦截HttpClient钩子适合您吗? 试着这样做: 创建拦截器:

@Injectable()
export class FinalInterceptor implements HttpInterceptor {

constructor(private errorHandlerService: HttpErrorHandlerService) {}

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
      return next.handle(req).pipe(
        tap((event: HttpEvent<any>) => {
            if (event instanceof  HttpErrorResponse) {
              this.errorHandlerService.handleError(event);
            }
        }));
  }
}

应用模块:

providers: [
    ...
    { provide: HTTP_INTERCEPTORS, useClass: FinalInterceptor, multi: true },
  ],

所以在我的http错误处理程序服务中 next console.log.

我想这正是你想要的

2

0

Code_maniac 7 年前

如果希望在catchError中包含HttpErrorResponse对象,请在api调用完成后尝试将其放入块中,如下所示:

delete(resourceNameOrId: number | string): Observable<HttpErrorResponse>{
    return this.http.delete<T>(this._url + resourceNameOrId)
 .pipe(
      catchError((error:any)=>{
           console.log(error);//error is the HttpErrorResponse object returned
           return this._handleError(`delete`, null)
      })
    );
  }